标签：cert 导入 OWIN bsp convert size win nat locate
这里列举了Java Array 的前十的方法。他们在stackoverflow最大投票的问题。
The following are top 10 methods for Java Array. They are the most voted questions from stackoverflow.
0.声明一个数组
0. Declare an array
String[] aArray = new String[5]; String[] bArray = {"a", "b", "c", "d", "e"}; String[] cArray = {"a", "b", "c", "d", "e"};
1.打印数组
1. Print an array in Java
int[] intArray = {1, 2, 3, 4, 5}; String intArrayString = Arrays.toString(intArray); //直接输出Array，输出,内存地址:[I@4554617c System.out.println(intArray); //输出：[1, 2, 3, 4, 5] System.out.println(intArrayString);
2.从数组中转为ArrayList
2. Create an ArrayList from an array
String[] stringArray = {"a", "b", "c", "d", "e"};
ArrayList<String> arrayList = new ArrayList<>(Arrays.asList(stringArray));
//输出[a, b, c, d, e]
System.out.println(arrayList);
3.判断数组是否含有某值
3. Check if an array contains a certain value
String[] stringArray = {"a", "b", "c", "d", "e"};
boolean b = Arrays.asList(stringArray).contains("a");
//true
System.out.println(b);
4.连接两个数组
4. Concatenate two arrays
//需要导入 org.apache.commons.lang3 int[] intArray1 = {1, 2, 3, 4, 5}; int[] intArray2 = {6, 7 , 8, 9, 10}; int[] combinedIntArray = org.apache.commons.lang3.ArrayUtils.addAll(intArray1, intArray2); String arrayString = Arrays.toString(combinedIntArray); //[1, 2, 3, 4, 5, 6, 7, 8, 9, 10] System.out.println(arrayString);
5.Declare an array inline --- 不知道这个的作用
method(new String[]{"a", "b", "c", "d", "e"});
6.将数组的每个元素取出拼接成字符串
6. Joins the elements of the provided array into a single String
String j = org.apache.commons.lang3.StringUtils.join(new String[] { "a", "b", "c" }, ":");
//a:b:c System.out.println(j);
7.将ArrayList转换为数组
7.Covnert an ArrayList to an array
String[] stringsArray = {"a", "b", "c", "d", "e"};
ArrayList<String> arrayList = new ArrayList<>(Arrays.asList(stringsArray));
String[] stringArr = new String[arrayList.size()];
arrayList.toArray(stringArr);
8.将数组转换为set
8. Convert an array to a set
String[] stringsArray = {"a", "b", "c", "d", "e"};
Set<String> set = new HashSet<String>(Arrays.asList(stringsArray));
System.out.println(set);
9.反转一个数组
9. Reverse an array
String[] stringsArray = {"a", "b", "c", "d", "e"};
ArrayUtils.reverse(stringsArray);
//[e, d, c, b, a]
System.out.println(Arrays.toString(stringsArray));
10.移除数组的某个元素
10. Remove element of an array
int[] intArray = { 1, 2, 3, 4, 5 };
int[] removed = ArrayUtils.removeElement(intArray, 3);//create a new array
System.out.println(Arrays.toString(removed));
One more - convert int to byte array
byte[] bytes = ByteBuffer.allocate(4).putInt(8).array();
for (byte t : bytes) {
System.out.format("0x%x ", t);
}
【翻译】Java Array的排名前十方法(Top 10 Methods for Java Arrays)
标签：cert 导入 OWIN bsp convert size win nat locate
原文地址：https://www.cnblogs.com/caoRM/p/8793512.html
